Box blank



FIG. 1 is a top plan view of a box blank, in an unfolded condition and on a reduced scale, showing my new design;

FIG. 2 is a top isometric view of a box blank, in a folded condition;

FIG. 3 is a bottom isometric view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a left elevation view thereof;

FIG. 6 is a right elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

The ornamental design for a box blank, as shown and described. 